Billie Joe Armstrong of Green Day performs at the iHeartRadio Music Festival on Friday, Sept., 21, 2012 at the MGM Grand Arena in Las Vegas. Eric Reed/Invision/AP

Green Day have canceled the rest of their remaining concerts scheduled for 2012 and postponed tour dates in early 2013, including a January show in Rochester.

The alternative rock band announced Monday that shows scheduled in November and December have been axed, with tickets being refunded at the point of purchase.

Also, performances from Jan. 7 through Feb. 8 will be rescheduled for later next year, including a Jan. 13 date at Rochester's Blue Cross Arena. New dates for those shows will be announced soon, Green Day said, and previously purchased tickets will be honored on the new dates.

Lead singer Billie Joe Armstrong has been undergoing treatment for substance abuse since an onstage meltdown at the iHeartRadio Festival in Las Vegas. Earlier this month, Warner Bros. chairman Rob Cavallo said the 40-year-old frontman's rehab is "no joke" and that he'd be "under medical supervision for a while to get him clean."

"Obviously the timing for [canceling these shows] isn't ideal, but Billie Joe's well-being is our main concern," bassist Mike Dirnt said in a press release. "We are happy to say that Billie Joe is doing well, and we want to thank you all for the outpouring of support and well wishes that we have received, and we can't wait to see you all again soon."

Rolling Stone reports Green Day also moved up the release date of Green Day's upcoming album "¡Tré! to December 11, 2012, ahead of its original date of January 15, 2013. The record is the third in a trio of new albums that includes last month's "¡Uno!" and "¡Dos!," which hits stores November 13th.

"We feel bad we have to delay our tour, so to make up for it we want to give our fans the music earlier than we had planned," drummer Tré Cool added. "If we couldn't be there to play it for you live, the least we could do was give you the next best thing."